Versuch, virtuelle Methode 'android.text.Editable android.widget.EditText.getText()' auf einem Nullobjekt Referenz

Question

aufrufen Ich versuche, die in meine Datenbank eingegebenen Daten zu speichern, aber ich bekomme den folgenden Fehler:

Ich habe mir andere ähnliche Fragen angesehen und meine verglichen und habe nicht die gleichen Probleme gefunden. Tut mir leid, wenn das eine zu einfache Frage ist, aber ich arbeite nicht regelmäßig mit Java.

This is my MainActivity : 



package ie.example.artur.adminapp; 

import android.os.AsyncTask; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.View; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 

import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.Statement; 

public class MainActivity extends AppCompatActivity { 


    EditText editText; 
    TextView textView; 
    private static final String DB_URL = "jdbc:mysql://192.168.1.6/tutorial"; 
    private static final String USER = "zzz"; 
    private static final String PASS = "zzz"; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     textView = (TextView) findViewById(R.id.textView); 
     editText = (EditText) findViewById(R.id.editText); 

     setContentView(R.layout.activity_register); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 
      } 
     }); 
    } 

    public void btnConn(View view) { 
     Send objSend = new Send(); 
     objSend.execute(""); 


    } 

    private class Send extends AsyncTask<String, String, String> 

    { 
     String msg = ""; 
     String text = editText.getText().toString(); 


     @Override 
     protected void onPreExecute() { 
      textView.setText("Please Wait Inserting Data"); 
     } 

     @Override 
     protected String doInBackground(String... strings) { 
      try { 
       Class.forName("com.mysql.jdbc.Driver"); 
       Connection conn = DriverManager.getConnection(DB_URL, USER, PASS); 
       if (conn == null) { 
        msg = "Connection goes wrong"; 
       } else { 
        String query = "Insert INTO student (name) VALUES('" + text + "')"; 
        Statement stmt = conn.createStatement(); 
        stmt.executeUpdate(query); 
        msg = "Inserting Successful!!"; 
       } 

       conn.close(); 

     } 

     catch(
     Exception e 
     ) 

     { 
      msg = "Connection goes Wrong"; 
      e.printStackTrace(); 

     } 

     return msg; 


    } 



@Override 
    protected void onPostExecute(String msg) {textView.setText(msg);} 



    } 




} 

Und das ist mein activity_register.xml:

<android.support.design.widget.AppBarLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:theme="@style/AppTheme.AppBarOverlay"> 

     <android.support.v7.widget.Toolbar 
      android:id="@+id/toolbar" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      android:background="?attr/colorPrimary" 
      app:popupTheme="@style/AppTheme.PopupOverlay" /> 

    </android.support.design.widget.AppBarLayout> 

    <include layout="@layout/content_main" /> 

    <android.support.design.widget.FloatingActionButton 
     android:id="@+id/fab" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_gravity="bottom|end" 
     android:layout_margin="@dimen/fab_margin" 
     android:src="@android:drawable/ic_dialog_email" /> 

</android.support.design.widget.CoordinatorLayout> 

Answer 1

zu Beginn der Aktivität Bewegen Sie setContentView

super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_register 

textView = (TextView) findViewById(R.id.textView); 
editText = (EditText) findViewById(R.id.editText);